package thread;

public class SyncDemo {
    private static boolean success1 = false;
    private static boolean success2 = false;

    public static void main(String[] args) {

        Bank bank = new Bank();
        int count = 1;
        while (true) {

            Thread t1 = new Thread() {
                public void run() {
                    success1 = bank.getMoney(20000);
                }
            };
            Thread t2 = new Thread() {
                public void run() {
                    success2 = bank.getMoney(20000);
                }
            };

            t1.start();
            t2.start();
            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
            }
            if (success1 & success2) {
                System.out.println("卡成功");
                break;
            } else {
                System.out.println("这是第" + count + "次尝试");
                bank.saveAccount(20000);
                count++;
                success1 = false;
                success2 = false;
            }
        }
    }
}

class Bank {
    private int account = 20000;

    public synchronized boolean getMoney(int money) {
        int account = getAccount();
        if (account >= money) {
            account = account - money;
            saveAccount(account);
            return true;
        }
        return false;
    }

    public void saveAccount(int account) {
        this.account = account;
    }

    public int getAccount() {
        return account;
    }
}